1. 10/20/09 UCLA Meeting Hauser 1/9 Various updates Update on LHC/CMS schedule: First shots into collimator: Nov. 7 and 8! Circulating beam ~Nov. 18, less than 1.1 TeV/beam before Xmas Seem to have dried out from CMS water leak w/o damage (?) Agenda taking shape for Oct. 28-30 CMS upgrade workshop at Fermilab See http://indico.cern.ch/conferenceTimeTable.py?confId=67916http://indico.cern.ch/conferenceTimeTable.py?confId=67916

2. 10/20/09 UCLA Meeting Hauser 2/9 Progress this week Improved Toy model for TOF for cosmics, single beams, collisions Current timing keys on AFEB fine delays corresponding to shortest cables  near top of large (ME2/2, ME3/2) chambers, changed geometry That increases cosmic ray TOF difference between top and bottom That made me readjust the “origin” points of cosmic rays to match data Z=0 (center of barrel) and y=+-500 cm (2 nd barrel station), more reasonable Slight bug in single beam timing pointed out by Darin Compare collision path length from (x,y,z)=0 to halo muons from z=0 Muonic timing parameters now calculated from TOFs

3. 10/20/09 UCLA Meeting Hauser 3/9 TOF calculations: cosmic rays But depends on steepness of cosmic ray spectrum with theta. Why not barrel wheels 1 or 2? X d d’ d’’ Wheel 0Wheel 1Wheel 2 We are back to d, my original guess

4. 10/20/09 UCLA Meeting Hauser 4/9 Downstream halo muon timing

5. 10/20/09 UCLA Meeting Hauser 5/9 Upstream halo muon timing

6. 10/20/09 UCLA Meeting Hauser 6/9 Minus endcap, cosmic rays, collisions, downstream halo

7. 10/20/09 UCLA Meeting Hauser 7/9 Muonic timing delays (TX) Derive ALCT delay values for muonic timing for one crate – Time sums make a lot of sense for ME-2/5 crate (bottom, dry…) TOF+Afeb_fine_delay+Skewclear+mpc_tx_delay – sigma 0.09 bx between the 9 chambers – Equation to use: TX n + tx n = S 0 + TX 0 + tx 0 – t 0 (reference chamber) - S n + t n Where S n = Skewclear cable delay time for each chamber. This is pre- calculated based on the known cable lengths for every chamber. TX n + tx n = Integer+phase delay for TMB  ALCT commands for each chamber t n = TOF for each chamber, pre-calculated based on the distance from the collision point (or from the reference chamber in the case of cosmic rays). – Put these by hand into parameters tmb_to_alct_data_delay (integer bx) and alct_tof_delay (2ns units), then Greg procedures measure return delays

8. 10/20/09 UCLA Meeting Hauser 8/9 Muonic timing return delay (RX) predictions Isochronous return of bc0 (from my UCLA meeting talk of 15 Sept 09): TX n + tx n + 2*S n + RX n + rx n = TX 0 + tx 0 + 2*S 0 + RX 0 + rx 0 (reference chamber) Note that t n (TOF) is not involved in this equation. Step 1 involves adjusting only RX n + rx n to make the left-hand side equal to the (fixed) right-hand side With reference chamber ME-2/1/14, values of TX and RX range between 6 and 9 – RX values average about 8, same as current fixed setting Expect constant, non-integer offset to the RX values measured for constant bc0 timing. Greg will hopefully measure the real values tomorrow

9. 10/20/09 UCLA Meeting Hauser 9/9 My to-do list Muon upgrade planning continues… Determine ALCT muonic timing parameters – Check out system-wide time sums to make sure method is sensible – Try to understand Greg RX values for VME-2/5 crate when measured – Documentation of procedure Determine procedure for setting CFEB muonic timing parameters Work on talks for the FNAL workshop Oct. 28 and the upcoming DOE review of UCLA Oct. 29-30 Start saving firmware versions for all Emu electronics boards into CVS Someday: – Initial planning for 269B course in Spring “Physics of the LHC”. Invite speakers early on. – Create a CRAFT 2009 timing synchronization CMS note? – Slow particle timing in CSC – Update my personal web page (dates from 2002)

10. 10/20/09 UCLA Meeting Hauser 10/9 Backup Slides

11. TMB #1 ALCT TOF delay TMB #2 ALCT TOF delay Master clock collision At BC0 ALCT1 ALCT2 TMB #1 sync TMB #2 sync Muon from BC0 TMB BC0 out TMB BC0 return Aligned! BC0 timing diagram: TX 2 bc0 delay TX 1 bc0 delay tx 1 TOF delay tx 2 TOF delay S 2 Skewclear delayS 1 Skewclear delay TMB clocks ALCT clocks S 2 Skewclear delay S 1 Skewclear delay rx 1 TMB-in phase rx 2 TMB-in phase RX 1 input data delay RX 2 input data delay CSC #1 CSC #2 Physical connections:  time (bx) 2 CSCs, TMB  ALCT